Recording element substrate

Abstract

A substrate includes a first and a second element arrays in each of which a plurality of elements is arrayed along a first direction of the substrate, a first and a second pad arrays in which a plurality of pads is arrayed along respective two opposite sides extending along a second direction of the substrate, a reception circuit configured to receive data for driving the elements, a data circuit configured to generate data corresponding to the first and the second element array, respectively based on the received data, a signal generation circuit configured to generate a period signal for determining a drive period of the elements based on the generated data, and an output circuit configured to output information related to the substrate.

What is claimed is: 
     
       1. A substrate, comprising:
 a first and a second element arrays in each of which a plurality of elements is arrayed along a first direction of the substrate; 
 a first and a second pad arrays in which a plurality of pads is arrayed along respective two opposite sides extending along a second direction of the substrate; 
 a reception circuit configured to receive low voltage differential signals for driving the elements; 
 a data generation circuit configured to generate data corresponding to the first and the second element arrays, respectively based on received data; 
 a signal generation circuit configured to generate a period signal for determining a drive period of the elements based on the generated data; 
 a confirmation circuit configured to confirm erroneous reception or transmission of data during a transfer; and 
 an output circuit configured to output information related to the substrate, 
 wherein the signal generation circuit, the reception circuit, and the data generation circuit are disposed in a first region between the first and second element arrays and the first pad array, and 
 wherein the output circuit is disposed in a second region between the first and second element arrays and the second pad array. 
 
     
     
       2. The substrate according to  claim 1 , further comprising:
 a first drive circuit configured to drive the elements contained in the first element array, 
 wherein the first drive circuit and the first element array are disposed in the second direction. 
 
     
     
       3. The substrate according to  claim 2 , wherein the first drive circuit comprises:
 a control circuit configured to output signals for driving, at different timing, elements belonging to each of a plurality of groups each including a predetermined number of adjacent elements in the first element array; and 
 shift registers allocated to the respective groups, 
 wherein the control circuit and the shift registers are arrayed along the first direction, and the control circuit is disposed closer to the second pad array than the shift registers. 
 
     
     
       4. The substrate according to  claim 1 , further comprising:
 a plurality of temperature detection elements; and 
 a selection circuit configured to select the temperature detection elements. 
 
     
     
       5. The substrate according to  claim 1 , further comprising:
 a determination circuit configured to determine parity of data transferred in the substrate. 
 
     
     
       6. The substrate according to  claim 1 , wherein the reception circuit receives data transmitted by differential signaling. 
     
     
       7. The substrate according to  claim 1 , wherein the signal generation circuit, the reception circuit, and the data generation circuit are not disposed in the second region. 
     
     
       8. The substrate according to  claim 1 , wherein the output circuit is not disposed in the first regions. 
     
     
       9. A method comprising:
 arraying a first and a second element arrays in each of which a plurality of elements along a first direction of a substrate; 
 arraying a first and a second pad arrays in which a plurality of pads along respective two opposite sides extending along a second direction of the substrate; 
 receiving low voltage differential signals for driving the elements; 
 generating data corresponding to the first and the second element arrays, respectively based on received data; 
 generating a period signal for determining a drive period of the elements based on the generated data; 
 confirming erroneous reception or transmission of data during a transfer; 
 outputting information related to the substrate; 
 disposing a signal generation circuit that generates the period signal for determining the drive period of the elements based on the generated data, a reception circuit that receives the low voltage differential signals for driving the elements, and a data generation circuit that generates the data corresponding to the first and the second element arrays, respectively based on the received data between the first and second element arrays and the first pad array; and 
 disposing an output circuit outputting the information related to the substrate between the first and second element arrays and the second pad array. 
 
     
     
       10. The method according to  claim 9 , further comprising:
 driving the elements contained in the first element array; and 
 disposing a first drive circuit and the first element array in the second direction. 
 
     
     
       11. The method according to  claim 10 , further comprising:
 outputting signals for driving, at different timing, elements belonging to each of a plurality of groups each including a predetermined number of adjacent elements in the first element array by a control circuit; 
 allocating shift registers to the respective groups; 
 arraying the control circuit and the shift registers along the first direction; and 
 disposing the control circuit closer to the second pad array than the shift registers. 
 
     
     
       12. The method according to  claim 9 , further comprising selecting temperature detection elements. 
     
     
       13. The method according to  claim 9 , further comprising determining parity of data transferred in the substrate. 
     
     
       14. The method according to  claim 9 , further comprising receiving data transmitted by differential signaling. 
     
     
       15. A substrate, comprising:
 an element array in which a plurality of elements is arrayed along a first direction of the substrate; 
 a first pad array in which a plurality of pads is arrayed extending along a second direction of the substrate; 
 a second pad array in which a plurality of pads is arrayed extending along the second direction of the substrate, the element array being disposed between the first pad array and the second pad array; 
 an output pad configured to output electrical signals from the substrate; 
 a reception circuit configured to receive low voltage differential signals for driving the elements; 
 a data generation circuit configured to generate data corresponding to the element array, based on received data which is received by the reception circuit; 
 a signal generation circuit configured to generate a period signal for determining a drive period of the elements based on generated data which is generated by the data generation circuit; and 
 a determination circuit configured to determine parity to detect a transfer error for data transferred in the substrate, 
 wherein the reception circuit, the data generation circuit, and the signal generation circuit are disposed in a first region between the element array and the first pad array; and 
 an output circuit configured to output, to the output pad, information related to the substrate, the output circuit being disposed in a second region between the element array and the second pad array. 
 
     
     
       16. The substrate according to  claim 15 , wherein the element array includes a first element array and a second element array. 
     
     
       17. The substrate according to  claim 16 , wherein the drive circuit comprises:
 a control circuit configured to output signals for driving, at different timing, elements belonging to each of a plurality of groups each including a predetermined number of adjacent elements in the element array; and 
 shift registers allocated to the respective groups, 
 wherein the control circuit and the shift registers are arrayed along the first direction, and the control circuit is disposed closer to the second pad array than the shift registers. 
 
     
     
       18. The substrate according to  claim 15 , further comprising:
 a drive circuit configured to drive the elements contained in the element array, 
 wherein the drive circuit and the element array are disposed in the second direction. 
 
     
     
       19. The substrate according to  claim 15 , further comprising:
 a plurality of temperature detection elements; and 
 a selection circuit configured to select the temperature detection elements. 
 
     
     
       20. The substrate according to  claim 15 , wherein the determination circuit further determines parity to detect a reception error for data received outside of the substrate. 
     
     
       21. The substrate according to  claim 15 , wherein the reception circuit receives data transmitted by differential signaling. 
     
     
       22. The substrate according to  claim 15 , wherein the output pad is included in the second pad array.